Mine Safety and Health Administration (MSHA) - Code of Federal Regulations - 30 CFR 75.705-11
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MSHA - Title 30 CFR
30 CFR § 75.705-11

Use of grounded messenger wires; ungrounded systems.

Solely for purposes of grounding ungrounded high-voltage power systems, grounded messenger wires used to suspend the cables of such systems may be used as a grounding medium.




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